Injection ampul



May 31, 1932. F; MEYER INJEGTION AMPUL Filed sept. 2o. 1929 gwnwncot Patented May 31, 1932 i' yUm'risu -sinlvres PATENToFFlcE- FELIX MEYER, 0E AAcHEN, GERMANY, AssIGNoE To wINTHaor CHEMICAL com- PANY, ING, 0E NEW Yom; N.l Y., A coRroaAmIoN or NEW vom:

INJECTION AMPUE Application med september 20,1929, serial No. 393,989, and in Germany :une 1s, 1927'.

by punctured. The invention consists in constructing the partition Wallin form of a movable body, which can slide in a piston-like manner in the ampul tube before lling up to the inner point of the hollow needle, the crosssection of the partition wall favourably being tapered towards the centre to form a membrane in the centre with advantage in such a manner that that side of the partition wall turned towards the needle is concavely shaped while the other side, forms a plane.

The injection ampul in accordance with thev invention is intended to serve for one single use, it carries the liquid to be used and contains the hollow needle, which is fused therein in the known manner andwhich is with advantage sharpened at both ends.

In order to more fully describe the invention one particular construction will herel after be described by way of example In the drawings:

Fig. 1 is a cross-sectional view of the ampul.

Fig. 2 is similar to Fig. l1 but showing a modified partition wall.

Fllig. 3 shows a further modified partition wa v l A partition wall (1) of rubber or similar material is situated inside the ampul (2) at some distance behind the needle point (3) which projects within the ampul. A particular characteristic of the wall is that it can be pushed forward in the simplest manner in a piston-like fashion prior to the filling of the ampul up to the needle point (3) and that it then produces a tight seal or the purpose of separating the needle from the injection liquid without necessitating any particular device and without thereby losing elasticity. Based on this elasticity the wall is pressed, on operating the injection ampul,

by the pressure exerted on the liquid against the needle and is punctured by the same with vthe result that the injection liquid can be discharged thereby through the needle. Appropriate modes of constructing the wall are lshown in the diagram in (l), (4) and (5).

(l) for example, is a rubber plate, which in order to produce the desired elasticity is tapered towards the centre in the fashion of' a membrane. (4) and (5), are hollow plugs; (5) shows in contradistinction to (4) likewise a membrane like tapering towards the centre opposite the needle. The space be'- tween the needle and the wall serves as an indication of the penetration of the needle point into the vein or artery, since in 4this case blood is discharged into this space.

Similar devices are known in which, however, the attached membrane vrequires special fixin devices, while in the present 1nvention t e membrane is movable and the sealing off' takes place automatically on accovering which protects the `-needle fromoutside contamination and inwhich the injection needleis firmly fixed in the ampul a.

movable elastic partition wall separating the;

needle from that part of the ampul carrying the liquid to be injected, which elastic j partition wall can slide in 'a ner in the ampul tube.

2. In an injection ampul in which the injection needle is firmly hxed in the ampul, a slidable elastic partition wall as claimed piston-like manin claim 1 the cross-section ofwhich is tapered I towards the centre. v 3'. In an injection ampul in which the injection needle is firmly fixed in the ampul, a slidable elastic partition wall as claimed in claim 1 the cross-section of which is tapered towards the centre to form a membrane. 4. In an injection ampul in which vthe injection needle is firmly fixed in the ampul, a slidable elastic partition wall as claimed 1n claim -l the cross-section `of which is roo tapered towards the centre to form a membrane in such a manner that that side of the wall turned towards the needle is .concavely shaped while the other side forms a plane. v

5s In an injection ampul in which the injection needle is completely enclosed by a glass covering which protects the' needle from outside contamination and in which the injection needle is rmly fixed in the ampul,

l0 a movable elastic partition wall separating the needle from that part of the ampul carrying the liquid to be injected, which elastic partltion wall can slide in a piston-like manner in the ampul tube.

15 In testimony whereof, I aix m si attire.

'- FELIX MEYE La] 

